Monessen Hearth Direct Vent Gas Insert IDV490NVC - Manual (Page 34)

34 57D0016
MAINTENANCE
YEARLY SERVICE PROCEDURE
Failure to inspect and maintain heater may lead to improper combustion and a potentially dangerous situation. A qualified
technician should do the following once a year.
1. Check pilot flame. Flame should touch approximately
3 /
8
" of the top of thermopile and touch top of thermocouple. See
Figure 43. If not, contact dealer for service.
2. Turn gas control knob to “OFF” position to shut off gas to heater. See step “To Turn Off Gas”, page 29. Let heater cool
for 15 minutes. Remove faceplate (see instructions included with face plate) and glass. See Page 31.
3. Carefully remove log set. If logs are severely deteriorated, replace logs. Check logs for sooting. A small amount of soot
along bottom of logs is normal. If excessive sooting is found, heater must be adjusted. Contact dealer where you bought
heater.
4. Clean burner and burner ports. See Figure 44.
5. Replace log set and rock wool per instructions on pages 21-23. Replace glass. Make sure gasket along perimeter of glass
contacts face of firebox and forms an airtight seal. Realign if airtight seal is not formed. Replace glass and glass frame
if damaged.
6. Inspect area behind face plate. Clean if necessary. Check gas control valve and all gas lines. If damaged, do not use
heater. Contact your dealer.
7. Start pilot and turn on main burner. Flames should be orange/yellow and not touch top of firebox. If pilot or main burners
do not burn correctly, contact your dealer for service. Monitor blower operation.
Figure 43 - Before taking unit
apart, check pilot flame. Flame
should touch thermocouple
and thermopile
Thermopile
Thermocouple
Check Burner Ports
Figure 44 - Checking Burner Ports and Burners